Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing our ornamental design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a front plan view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left view thereof; and,

FIG. 8 is a right view thereof.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 